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3AX31......
电路见图1。合上电源开关K,电阻3kΩ与1.8kΩ分压后,A点电位大约为2.2V,B点电位为0V。主持人宣布开始抢答后,设某一按钮(假设K1)按下,则对应的单向可控硅SCR1导通,L1亮。SCR1导通后,2只1N4007......
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3AG433AK20......
CD4013.9013......
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3AX31B3AX31......
3DG6......